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• sendmail appends server name to external domains when relaying

  - by Chris

  My server is set to send all email to a corporate relay server. For the company domain, it works perfectly. I've recently found emails being sent to an outside domain are getting the hostname of my server appended to the email prior to being sent. Here is the log entry for one such attempt. Nov 6 09:46:45 myservername sendmail[45023]: rA6EkjiI045023: [email protected], delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30590, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (rA6Ekj2g045037 Message accepted for delivery) Nov 6 09:46:45 myservername sendmail[45061]: rA6Ekj2g045037: to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120885, relay=relay.company.com [x.x.x.x], dsn=2.0.0, stat=Sent (ok: Message 342335947 accepted) Notice the email address difference between it being accepted by my server for delivery (correct email address), and being sent and accepted by the corporate relay (incorrect with server name appended). To make it more interesting, the application on my server uses email for user account verification/activation. In August, this particular user was able to register his account and activate it. I have made no configuration changes to mail since setting the server up over a year ago. DNS is also a corporate service. I've never touched my /etc/resolv.conf configuration. domain company.com nameserver <ip1> nameserver <ip2> search myservername Thanks!

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• Unnamed, hidden partitions on my 500 GB HD, HP Pavilion dm4 Laptop

  - by emotionull

  I have multiple doubts here. Its a Seagate 500GB 7200RPM HD. I had installed it few months back after my original Laptop HD stopped working. The current drives on my latop, as shown by the Windows Disk Management are: After installing the new HD, I had done a complete clean install of Windows 7 and I didn't create any parition myself, manually. So there are 4 drives. Even previously, before I installed this new HD, my laptop had 4 Partitions. But the there were no un-named partitions like the two in this case. The other two were HP tools and Recovery or something. It was pre-configured, Factory installed Windows. Also, now when I right cick on the unnamed Drives from Disk Management, all the options are greyed out (see image) except the delete partition image. So how do I know what's inside those partitions? Will it be ok if I delete them? I want install Ubuntu and dual boot it with my current windows installation. I cannot do it in current setup as there are already 4 partitions of my HD and if I will try to make a new partition, it will be a logical one (correct me if I am wrong here). So can I delete the un-named, hidden partitions and use them for Ubuntu? A bit unrelated question. As a backup option, can I use the Windows 7's Backup and Restore facility to keep a complete backup of all the drivers and system softwares.

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• Calculating memory footprints using /proc/sysvipc/shm

  - by MarkTeehan

  This is for a SLES 10 database server. One of my servers runs three databases and three app servers; I am analyzing how their shared memory segments grow and shrink to avoid intermittent out-of-memory scenarios. "Top" is hot helpful for this since its calculations for RES and VIRT are inconsistent. I am doing this by matching up the contents of /proc/sysvipc/shm with memory usage reported by the database admin console. I do this by totaling up saving the contents of /proc/sysvipc/shm and then total up "bytes" for all of the segments for the offending userid. This is a large server with hundreds of segments and tens (or hundreds) of GB of allocated memory per userid. However it doesn't match up - the database management software claims to be using around 25% more memory than the total I calculate. Negligible swap space is in use, so I am ignoring that. I am running it as root so I am sure I see all shared memory segments. My question is : is all (significant) allocated memory recorded in /proc/sysvipc/shm, or is this only shared memory (*and not "un-shared" memory?). If this is incorrect, what is the correct way to calculate out the total allocated memory for each userid? Also: I believe doing a 'cat' on this file locks server IPC. I check it every 5 seconds - is it likely that this frequency could be problematic? Thanks! Mark Teehan Singapore

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• Windows7: Howto force a "do you really want to shutdown?" dialog

  - by Vokuhila-Oliba

  Sometimes I wanted to choose "logout current user", but then I hit "Shutdown" by accident. Nearly everywhere else Windows7 is asking "do you really want to do this Yes/No". But that's not the case when I hit the "Shutdown" button. Windows7 shuts down immediately without giving me the chance to correct my mistake. Q1: So I am wondering why Windows7 shuts down immediately without asking "really do that?" in this case. Q2: Is there a way to change this behavior? E.g. Could I force Windows7 to display a dialog asking "Do you really want to shutdown ?". ADDED: I am running Windows7 Professional 64bit. ADDED: I tried to change this behavior with the policy editor. It seems to be very easy to completely remove the Shutdown button from the start menu. But I couldn't find an entry to turn on such a Yes/No dialog.

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• Updating files with a Perforce trigger before submit [migrated]

  - by phantom-99w

  I understand that this question has, in essence, already been asked, but that question did not have an unequivocal answer, so please bear with me. Background: In my company, we use Perforce submission numbers as part of our versioning. Regardless of whether this is a correct method or not, that is how things are. Currently, many developers do separate submissions for code and documentation: first the code and then the documentation to update the client-facing docs with what the new version numbers should be. I would like to streamline this process. My thoughts are as follows: create a Perforce trigger (which runs on the server side) which scans the submitted documentation files (such as .txt) for a unique term (such as #####PERFORCE##CHANGELIST##NUMBER###ROFL###LOL###WHATEVER#####) and then replaces it with the value of what the change list would be when submitted. I already know how to determine this value. What I cannot figure out, is how or where to update the files. I have already determined that using the change-content trigger (whether possible or not), which "fire[s] after changelist creation and file transfer, but prior to committing the submit to the database", is the way to go. At this point the files need to exist somewhere on the server. How do I determine the (temporary?) location of these files from within, say, a Python script so that I can update or sed to replace the placeholder value with the intended value? The online documentation for Perforce which I have found so far have not been very explicit on whether this is possible or how the mechanics of a submission at this stage would work.

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• How do I setup an Alias on Apache with XAMPP on Linux ? (Permission problem)

  - by knarf

  XAMPP works fine but I want to have http://localhost/f to point to /home/knarf/prog/php/fwyxz. I've chmod -R 777 /home/knarf/prog/php/fwyxz I've added Alias /f /home/knarf/prog/php/fwyxz at the end of the httpd.conf And when I try to access it, I get a 403. From the apache error_log: [error] [client 127.0.0.1] (13)Permission denied: access to /f denied. I've already tried several solutions (userdir and symlinks) but they both failed with the same error. I've also tried to add this after the Alias: <Directory "/home/knarf/prog/php/fwyxz"> Order allow,deny Allow from all </Directory> But again, permission denied. Now if I change the User/Group under which apache runs from nobody to knarf, it seems to work (static files are ok) but PHP can't use/initialize sessions : [error] [client 127.0.0.1] PHP Warning: session_start() [function.session-start]: open(/tmp/sess_r5nrmu4ugqguqqe83rs53lq6k0, O_RDWR) failed: Permission denied (13) in /home/knarf/prog/php/fwyxz/index.php on line 3 [error] [client 127.0.0.1] PHP Warning: Unknown: open(/tmp/sess_r5nrmu4ugqguqqe83rs53lq6k0, O_RDWR) failed: Permission denied (13) in Unknown on line 0 [error] [client 127.0.0.1] PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0 This is really frustrating.

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• Exchange 2010 mail routing with Hub Transport in multiple sites

  - by jmreicha

  I have two separate physical sites, Site A and Site B. In site A, I have following: 2 CAS servers 2 Hub Transport servers 2 Mailbox servers 2 Edge servers In site B, I have the following: 1 CAS 1 Hub 1 Mailbox 1 Edge Currently everything is working out of site A. That is, all users are housed on mailboxes that are in site A and all inbound mail flow is pointing to site A. I would eventually like to be able to move some of the mailboxes to site B without causing a disruption for resliency and redundancy purposes but I am not quite sure how to go about setting this up or if it is even possible. So far I have created an Edge subscription in site B and am able to send emails out from test accounts set up with mailboxes on the site B Mailbox server. However, I am unable to receive incoming mail messages and am confused. So I'm thinking incoming mail messages are still being directed to site A and then they are getting stuck because there is no way to route the mail to the site B mailboxes. Is this assumption correct? I am unfamiliar with mail flow and routing so I am not really sure what I need to be looking at? Would I add the site B hub transport to the Edge subscription in site A? Or I guess more specifically, how would I go about enabling communication and mail flow between mailboxes split up on site A and B?

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• Configuring WPA WiFi in Ubuntu 10.10

  - by sma

  Hello, I am trying to configure my wireless network on my laptop running Ubuntu 10.10 and am having a bit of difficulty. I am a complete Linux newb, but want to learn it, hence the reason I'm trying to set this up. Here's the vitals: It is a Gateway 600 YG2 laptop. It was previously running Windows XP, but I installed Ubuntu 10.10 in place of it (not a dual boot, I removed XP altogether). I have an old wireless card that I'm trying to resurrect. I haven't really used the card in a couple years, but it seems to still work, I just can't connect to my home's wireless network. The card is a Linksys WPC11 v2.5. When I plug it in, Ubuntu recognizes the network, but won't connect to it. My home network uses WPA encryption and the only connection type that Ubuntu's network manager is giving me is WEP and then it asks for a key -- I have no idea what that key should be. So, basically, I'm asking, is there a way I can instead connect through WPA? I've tried creating a new connection in network manager, but that won't work, it keeps falling back to the WEP connection and asking me for a key. I have tried to install the XP driver using ndiswrapper but I don't know if that's working or not. Is there a way to tell if: A) the card is working as it should B) the correct drivers are installed (again, I installed the XP one using ndiswrapper NET8180.INF, but I'm not sure what to do next) Any help would be appreciated. Thank you.

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• Silent install of Japanese Language Pack in Win7

  - by Doltknuckle

  Every year, due to re-imaging, I am forced to find a way to install the Japanese language pack on a collection of 30 computers. Each year I look for a way to automate this process, and each year I am forced to do this manually. Maybe this year will be different. Has anyone had any luck with installing and configuring far east language support for windows 7 without user interaction? I have already downloaded kb972813 and have a way to get it out to the computers. What I normally do is this: Run the EXE, use the default settings. Open up language settings and create the JP keyboard. Configure the language bar settings. Copy settings to default user. Delete the local user cache. Sign the different user accounts in to make sure that the default settings are correct. This whole process takes about 10 minutes, multiply that out by 30 machines and you are looking at a 5 hour process. If I can log into all of the computers at once, I can normally cut that down to about an hour. Any ideas would be appreciated. Thanks in advance

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• Which RAM is faster (or, is Crucial's Memory Advisor giving non-optimal advice)?

  - by adpe

  In general, if a PC's motherboard is only specified for RAM up to a given core speed x, will that PC be faster with: RAM of latency y capable of running at a maximum core speed >x or RAM of latency <y capable of running at a maximum core speed of exactly x ? I would have thought the latter, but Crucial's Memory Adviser tool advises the former. So, which of us is correct - me, or the machine? (Here is a concrete example: I wish to upgrade a Toshiba Satellite Pro L300-155 laptop from its current 1GB RAM to 2GB Crucial RAM. The laptop's specifications are given here. I see from those specifications that the laptop is designed for DDR2-667 Ram. Crucial sells two compatible 2GB kits, priced exactly the same as each other: DDR2-667, CL=5; DDR2-800, CL=6. It seems to me that of these two upgrade kits, the first kit would run slightly faster on the L300-155 than the second, because both will presumably be capped at DDR2-667 core speed (see laptop specs), but the second kit has more latency. However, Crucial's Memory Advisor tool recommends the second kit.)

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• Verification of downloaded package with rpm

  - by moooeeeep

  I wanted to install a package on CentOS 6 via rpm (e.g., the current epel-release). EDIT: Of course I would always prefer the installation via yum but somehow I failed to get that specific package installed using this normal approach. As such, the EPEL/FAQ recommends Version 2. As I'm downloading the package through an insecure channel (http) I wanted to make sure that the integrity of the file is verified using information that is not provided with the downloaded file itself. Is this especially true for all of these approaches? I've seen various approaches to this on the internet: Version 1 rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm Version 2 rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm Version 3 wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm rpm --import https://fedoraproject.org/static/0608B895.txt rpm -K epel-release-6-7.noarch.rpm rpm -i epel-release-6-7.noarch.rpm I do not know rpm very well, so I wondered how they might differ? My guess (after reading the manpage) is that the first should only be used when the package is previously not installed, the second would additionally remove previous versions of the package after installation, the first two omit some verification steps before the actual installation that are done by rpm -K. So my main questions at this point are Are my guesses correct or am I missing something? Is the rpm --import ... implicitly done for the first two approaches as well, and if not, isn't it necessary to do so after all? Are these additional checks performed by rpm -K ... any relevant? What is the best (most secure, most reliable, most maintainable, ...) way of installing packages via rpm in general?

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• User Group Policy in Server 2008 to set Default Profile settings

  - by Chris

  I have computers to deploy and want to apply changes to the default user policy on these PCs automatically. What's the best way to do this? Our current procedure is: Create the computer account in an OU called "Deployment" on our server Unbox the PC Login as the user who will be receiving the PC Change settings (pre-configure outlook, authorize Office, etc.) move computer account to correct OU Place the PC on the users desk. I would like to make as many of the changes in step #4 with Group Policies applied to the Deployment OU if possible since they're largely repeated for every computer. There are a dozen policies created and the computer ones apply correctly but the user policies do not. I understand this is because the end user is not in our "Deployment" OU. I don't want to apply these settings to the user at their current station just the new PC I'm working on. I believe I have the desired effect with Group Policy Loopback Replace enabled on policies that need user policies changed but this just feels wrong/inefficient/complicated to maintain. Am I doing this correctly? Is Group Policy Loopback the only way to change user accounts on one computer? What do you do to setup a user on a new PC?

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• Windows 7 product key, which is the valid one - in registry or on a sticker?

  - by me how

  I am not too familiar with the software licensing and how this all works, but I have a question regarding Windows 7 and partially Office - generally Microsoft products. I have been asked to assist our IT guy who wants to collect all the product IDs for Windows 7 and Office. I haven't been given much details how to go about it and how to collect it. After a bit of research I have decided to use a freeware that pulls the software licenses out of the registry. I thought that was the easiest and would provide the most accurate product IDs. I've used Belrac Avisor to obtain all the informations. It turns out that about 25 machines use the same product key. I have asked if the company has bought a commercial license or something but there isn't anyone available at the moment who could answer my question. I have told the IT guy that there are 25 machines using the same product key and asked if that is alright. He told me to go around and write the product keys from the sticker(label) on each machine. I am just not quite sure if that's the right approach specially that the numbers do not match.... So, now I see that the numbers aren't matching and my question is in terms of software licensing which is the VALID and correct product key to provide if ever questioned about software license? Is it the number on the sticker or is it the number stored in the registry?

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• Ping results "echo'd" out to a text file on Windows XP machine has unusual character rather than the outcome

  - by Richard Rice

  Here is the situation. I have a Windows XP machine that I would like to ping another machine and send the output to a text file for review at a later date. This is quite a standard question with several answers on this website and others. The issue I have is that when reviewing the txt file afterwards, the outcome of the ping appears as a strange character. A screenshot of the text file output can be found at the following link. Please note its the first 8 ping outputs that have a strange character. The %%B was me hoping that would output what I wanted! (Cannot upload image to any hosting websites because the company I work for seems to be afraid of them ....) Here is the code I'm using: @echo off For /f "tokens=1-2 delims=/:" %%b in ("%TIME%") do (set mytime=%%a%%b) PING 1.1.1.1 -n 1 -w 1000 >NUL for /f "tokens=*" %%A in ('ping 192.168.5.2 -w 10 -n 1') do (echo %date% %time% %%A >> C:\Temp\Ping_Checks\GarrickSide.txt && GOTO Ping ) :Ping PING 1.1.1.1 -n 1 -w 1000 >NUL for /f "tokens=* skip=2" %%A in ('ping 192.168.5.2 -w 10 -n 1') do (echo %date% %time% %%A >> C:\Temp\Ping_Checks\GarrickSide.txt && GOTO Ping ) This code works fine on a Windows 7 machine, but not on a Windows XP machine. It appears that the echo command isn't outputting the right data, but I don't understand this enough to correct it. Can anyone spot where I'm going wrong?

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• How do you permanently disable the 'This Connection is Untrusted' page on Firefox

  - by TheIronChef9

  I'm going insane. Can someone please help me to COMPLETELY DISABLE the 'This Connection is Untrusted' page on Firefox. Facts: I am running Firefox 23.0 on an Ubuntu machine (downloaded and installed ubuntu today) It is a work computer and I have to use my employer's proxy While visiting Webpages/webapps like Gmail or Google brings up the 'This Connection is Untrusted' page and I have to go through the whole tedious task of selecting 'I understand the Risks' and add Exceptions, etc. etc. The fact is, I don't care about the risks. I would rather this computer melt into the ground than have to see that page ever again. I want to dance naked in untrusted pages and not give a damn about the consequences. I just never want to see that page again. Ever. For some sites (eg. wikipedia), the css doesn't load and I end up seeing them in plain text. As a result these sites are completely useless. Wasted hours trying to solve this for stackoverflow.com. These issues happen on the Firefox on my Windows XP machine as well (also using the same proxy). I don't want to export/import certificates or create exceptions for every site that shows this bloody page. I just want this page gone. I don't want Firefox to tell me what's safe and what's not. Also, my system time and date are correct. I've also tried the lies on this page too with no good results. Edit: I've also tried the whole going into the Advance-Certificates-validation setup page and unchecked 'Use the Online Certificate Status Protocol (OCSP) to confirm the current validity of certificates' checkbox. Nothing happened even after restarting firefox or rebooting. I need help. Thanks.

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• Email Proxy Ideas

  - by jtnire

  Hi Everyone, I wish to host some managed email servers for some customers. Each customer will have their own email server which will be an all-in-one virtual machine running postfix, dovecot and some webmail suite. Even though each customer will have their own server, I do not wish to give each email server it's own public facing IP. I wish to avail the use of proxy servers so all customers use the same public IP. As for the "smtp-in" from the public internet, this isn't a problem as I can set up many mx servers (using postfix) which will store-and-forward the mail to the correct server (using transport maps). As for the IMAP access from the customer, I was thinking of using perdition which is an IMAP proxy - I believe that this will suit my needs. I am confused however on what to use for the "smtp-out" proxy. The customers will have to authenticate with their receptive email server, however they will have to go via a proxy of some sort as they won't have direct access to their server instance. It probably can't be a store-and-forward proxy either. Does anyone have any idea on what I could use here? Many Thanks

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• sql server uninstallation issue

  - by angel

  I'm unable to remove SQL Server 2008 sp1 completely from my system. I'm using windows 7 ultimate. Everytime I try uninstalling it i get the following error. How can I remove it? here is the log: Overall summary: Final result: Failed: see details below Exit code (Decimal): -2068643839 Exit facility code: 1203 Exit error code: 1 Exit message: Failed: see details below Start time: 2013-06-24 21:10:38 End time: 2013-06-24 21:21:17 Requested action: Uninstall Log with failure: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20130624_210908\sql_rs_Cpu64_1.log Exception help link: http://go.microsoft.com/fwlink?LinkId=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.0.1600.22 Machine Properties: Machine name: ABHI-PC Machine processor count: 4 OS version: Windows Vista OS service pack: Service Pack 1 OS region: United States OS language: English (United States) OS architecture: x64 Process architecture: 64 Bit OS clustered: No Product features discovered: Product Instance Instance ID Feature Language Edition Version Clustered Sql Server 2008 MSSQLSERVER MSRS10.MSSQLSERVER Reporting Services 1033 Enterprise Edition 10.0.1600.22 No Sql Server 2008 Management Tools - Basic 10.0.1600.22 No Package properties: Description: SQL Server Database Services 2008 SQLProductFamilyCode: {628F8F38-600E-493D-9946-F4178F20A8A9} ProductName: SQL2008 Type: RTM Version: 10 SPLevel: 0 Installation edition: ENTERPRISE User Input Settings: ACTION: Uninstall CONFIGURATIONFILE: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20130624_210908\ConfigurationFile.ini FEATURES: RS,SSMS,SNAC_SDK,CE_RUNTIME,CE_TOOLS,SNAC HELP: False INDICATEPROGRESS: False INSTANCEID: INSTANCENAME: MSSQLSERVER MEDIASOURCE: QUIET: False QUIETSIMPLE: False X86: False Configuration file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20130624_210908\ConfigurationFile.ini Detailed results: Feature: SQL Client Connectivity Status: Skipped MSI status: Passed Configuration status: Passed Feature: SQL Client Connectivity SDK Status: Skipped MSI status: Passed Configuration status: Passed Feature: Reporting Services Status: Failed: see logs for details MSI status: Passed Configuration status: Failed: see details below Configuration error code: 0xFFD65603 Configuration error description: Input string was not in a correct format. Configuration log: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20130624_210908\Detail.txt Feature: SQL Compact Edition Tools Status: Passed MSI status: Passed Configuration status: Passed Feature: SQL Compact Edition Runtime Status: Skipped MSI status: Passed Configuration status: Passed Feature: Management Tools - Basic Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Rules with failures: Global rules: There are no scenario-specific rules. Rules report file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20130624_210908\SystemConfigurationCheck_Report.htm

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• JavaScript settings are on but I still have issues with web sites using JavaScript.

  - by Mike

  I have two computers that are the same at home except I have installed Adobe Acrobat 9 Pro Extended on my main computer along with the 2010 Outlook (Beta). I have issues when I log into a website that uses pop up calendars to select the date. I pasted it below. I checked my other computer and it is fine. I've checked the Java setting and they are correct. I am at a loss. Any suggestions? Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; HPDTDF; OfficeLiveConnector.1.4; OfficeLivePatch.1.3; eMusic DLM/4; .NET4.0C) Timestamp: Mon, 26 Jul 2010 22:03:59 UTC Message: 'CalendarPopup' is undefined Line: 390 Char: 2 Code: 0 Message: 'CalendarPopup' is undefined Line: 410 Char: 2 Code: 0

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• VLAN issues between linux kernels 2.6 / 3.3 in an ESX / Cisco environment

  - by David Griffith

  I shall attempt to explain an issue I have encountered - I have a VM running on esx 4.1 with an interface connected to VLAN800 via an access port on a cisco 3750. It runs linux - kernel 2.6.24, and has about 5 to 10 Mbit of chatter on 10.10.0.0/16 and various multicast addresses to look after. I needed to isolate certain devices from certain other devices on the network, with all of them having to talk to that one VM. No, the address space can't be separated, nor can the networks be easily vlan'd apart. The software on the VM listens to one interface only. Private vlans appear to be the way to go. So as a test, I built a bridge on the VM that globs together the vlans as needed. All good, everything works as expected. But occasionally (sigh) there's some latency that trips up a couple of profinet devices on the network because, you know, you're not really supposed to trunk real-time protocols around the place willy-nilly. I shift it to our test/backup server - works nicely, but I don't want it to be running on the test server as we muck around with that a lot. So I says to myself, "I'll put it on a new VM for testing and tweaking." I download a small linux distro with kernel 3.3, and install as a new VM with a the vlans as separate interfaces for testing. I power up the testing VM - ok. I bring up all the separate interfaces - ok. I can ping the production VM, see all sorts of traffic going past with tshark, etc. I build a bridge and put the primary vlan on it - the production VM running 2.6 immediately loses its multicast traffic - Unicast is fine. (?) I shut down the bridge - still no multicast traffic (!?) I power-cycle the production VM(!?!?) - multicast traffic returns. I trunk everything into the testing VM and create vlan interfaces under linux instead - same result, as soon as I start the bridge.... no multicast on the production VM. Ok, so I take a break and leave things alone. I decide to play with a couple of ubiquiti bullet radios - I'm testing various firmware as a side project. I flash a radio with Open-wrt-12.09. I enable a trunk on a port on a cisco on our network so I can muck around with multiple vlans and SSIDs I power up the radio and connect - ok. I create a vlan interface from the trunk.... the same vlan as the production VM wayyyyy over there, three cisco routers away. Ok. I bridge the vlan interface to the wifi interface and immediately get a phone call. The production VM has (suprise!) lost its multicast traffic. Again, nothing comes back until I power-cycle the VM. What the hell is going on?

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• Throughput and why do ISPs sell too much bandwidth?

  - by jonescb

  I hope the question made sense how I worded it. :) I've been wondering, maximum theoretical bandwidth is measured as RWIN/RTT (Window size / round trip time) Source 1 and Souce 2 So if a major city only 100 miles away gives me a ping of 50ms, and I have the default 64kb TCP window size then my maximum throughput will be 12.5Mb/s. Everything further away would give me a higher ping and therefore a lower throughput. Is there any reason to buy something like FiOS with a 50Mb/s or greater connection? Will you ever be able to reach that kind of speed? I know you can increase the TCP window size to increase throughput, but it has to be at both ends which is a deal breaker because you can't control the server. I'm assuming other network protocols like UDP aren't quite as affected by latency as TCP is, but how much of overall network traffic does non-TCP make up vs TCP. Am I just misguided about how throughput works? But if the above is correct, then why should a consumer like me buy way more bandwidth than can be realistically used. Maybe the only reason is for downloading multiple things at once, or one thing from multiple servers/peers?

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• Configure server on network to analyze traffic

  - by Strajan Sebastian

  I have the following network: http://i.stack.imgur.com/rapkH.jpg I want to send all the traffic from the devices that connect to the 192.168.0.1 router to the 192.168.10.1 router(and eventually to the Internet), by passing through the server and an additional router. Almost 2 days have passed and I can't figure what is wrong. While searching on the Internet for some similar configuration I found some articles that are somehow related to my needs, but the proposed solutions don't seem to work for me. This is a similar article: iptables forwarding between two interface I done the following steps for the configuration process: Set static IP address 192.168.1.90 for the eth0 on the server from the 192.168.1.1 router Set static IP address 192.168.0.90 for the eth1 on the server from the 192.168.0.1 router Forwarded all the traffic from 192.168.0.1 router to the server on eth1 interface witch seems to be working. The router firmware has some option to redirect all the traffic from all the ports to a specified address. Added the following rules on the server(Only the following, there aren't any additional rules): iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE iptables -A FORWARD -i eth1 -o eth0 -m state -–state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT I also tried changing iptables -A FORWARD -i eth1 -o eth0 -m state -–state RELATED,ESTABLISHED -j ACCEPT into iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT but still is not working. After adding the following to enable the packet forwarding for the server that is running CentOS: echo 1 /proc/sys/net/ipv4/ip_forward sysctl -w net.ipv4.ip_forward = 1 After a server restart and extra an extra check to see that all the configuration from above are still available I tried to see again if I can ping from a computer connected to 192.168.0.1/24 LAN the router from 192.168.1.1 but it didn't worked. The server has tshark(console wireshark) installed and I found that while sending a ping from a computer connected to 192.168.0.1 router to 192.168.1.1 the 192.168.0.90(eth1) receives the ping but it doesn't forward it to the eth0 interface as the rule tells: iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT and don't now why this is happening. Questions: The iptables seem that don't work as I am expecting. Is there a need to add in the NAT table from iptables rules to redirect the traffic to the proper location, or is something else wrong with what I've done? I want to use tshark to view the traffic on the server because I think that is the best at doing this. Do you know something better that tshark to capture the traffic and maybe analyze it?

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• Run 3 monitors on two different video cards?

  - by hullot

  Can I run 3 monitors on two different video cards? I have an ATI and Nvidia brand card. The ATI has 2 HDMI connections. They both work. Both cards are also picked up in Windows, one being the ATI and the other one as the Nvidia, but it says VGA Controller, although the card only takes 2 DVi. So, one DVI cable goes into that Nvidia card. 3 Monitors, but only 2 the HDMI ones from the ATI pick up, not the third one which is connected to the Nvidia via DVI. How can I run three monitors then? I suppose I can't install both drivers, so I'm unsure what to do. Is this possible? I just want the Nvidia card to power the third screen, no gaming on it, nothing. Also the ATI is picked up as primary card as well, so no hurdle there. EDIT: Hm, just installed the Nvidia drivers and it picked up the third screen no problem. Hope there aren't any major conflicts. Will post this as an answer as correct when I'm able. Can't as a new user.

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• Anyone have a script to delete a specific local windows profile?

  - by Jordan Weinstein

  I'm looking for Powershell (preferred) script, or .CMD or .VBS, to delete a specific user profile on a workstation (WinXP) or terminal server (2000, '03 or '08). I know all about the delprof utility... That only allows you delete based on a period of inactivity. I want a script to: prompt admin for a username delete that username's profile and to delete the entire profile - registry hive too (not just the folder structure within Documents and Settings). The same way it would if you went to My Computer Properties Advanced tab User Profiles Settings and deleted profiles from there. Any ideas? All I can think of is doing an AD lookup to get the SID of the user specified, then using that to delete the correct registry hive too... something simpler would be nice though... Basically, my HelpDesk used to be local administrators on our Citrix servers and a common fix for various issues was for them to delete a user's profile on the citrix server(s) and have that user log back in - voila, whatever issue they had was resolved. Going forward, in new Citrix environment, they will no longer be local admins on those boxes, but still need to be able to delete profiles (deleting the entire profile: folder and reg hive is key). thanks.

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• Scanning to network share

  - by tking

  In our environment we have several printers with the scan to folder functionality set up. It worked pretty well. Long story short- I needed to reboot our file server one evening (the server whose $hares where all the scans go), upon on boot up I received a message stating the name of the file server (i.e AcmeFS1; Windows Server 2003) could not be used because there was a duplicate name on the network. I found that somehow another printer on the network was using the name of the file server. Weird - I know. People could no longer scan to their folders. I ran an nbtstat on the file server and found that the local netbios name table was empty. I renamed the offending printer and rebooted the file server once more. This time, no error, and once I ran nbtstat again, I found that correct name and domain in the local netbios name table. Problem is, scan to folder is still not working. I know this was working before I rebooted the file server the first time. Anyone have any idea what is going on and how to fix? Thanks. FIXED: Not sure why the reboot didnt fix it but I restarted the "Server" service on the file server and the problem went away.

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• Trouble with Remote Desktop pulling through printers. Drive Redirection works, and the ports created but not the printers

  - by Windex

  I've run out of things to look into. All the support documents have been gone through and still provide no resolution. I've checked the service permissions, (sc sdshow spooler) they all match up with other systems and what is output on the support documents. I'm nearly positive that the issue can't be permissions anyway as the software requires all users to be an administrator, so all users are a local administrator. (I haven't looked into why yet but its on the list, I was just recently brought into this team and we've put procedures in place for quick recovery.) We've applied hot fixes relating to RDS and printing, though I'm not sure which ones they were. I've combed through group policy and no where is printer redirection disabled. It's setup with all default values regarding the use and redirection of printers and a quick install of W2k8 R2 shows that it works by default. This dev install was joined to the same domain, placed in the same OU, shows the same policies applied, etc, etc, etc, The server generates all the correct redirected ports but no printers are created. It will also redirect drives without issue, this would seem to rule out the usermode service that handles redirects being broken. No events are logged related to any of the events and there are no events from the TerminalServices-Printer source. There were local printers setup. I didn't think it would mattter but as I was running out of ideas I tried deleting them all with no change. The TS was configured for the software it will be running before we checked out the redirection of printers so the other team responsible to setting up new servers wants to find a fix instead of reloading a new server. I'm not sure where or what else to look for. Any ideas?

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